Brew Day Recipe Calculator: a free Claude skill

A small skill that takes your recipe and works out estimated OG, FG, ABV, IBU and color, shows the working and compares it to your target style.

• Gravity, ABV, IBU and color
• Formulas shown
• Style check with simple fixes

Made by Brew Day, part of What If Labs.

Install it

1. Download brew-day-recipe-calc.zip (don’t unzip it).
2. In Claude on the web or desktop, open Customize, then Skills, click +, choose Upload a skill and pick the ZIP.
3. Make sure code execution is on in Settings, Capabilities. It works on any Claude plan, including the free one.
4. Ask Claude something in plain words. It picks the skill up on its own.

Using Claude Code instead? Copy this folder into ~/.claude/skills/.

Try a free tool first

No Claude needed: the ABV and Priming Sugar Calculator for Homebrew runs in your browser and shows its working.

Want the whole thing?

The Brew Day Brewing Companion is $15, one time, with a 14-day refund. Design, brew, ferment, package and troubleshoot.

• Recipe design to style
• Scaling and extract conversion
• Timed brew day schedule
• Water and mash chemistry
• Yeast and fermentation plans
• Priming sugar and keg pressure
• Off-flavour troubleshooting
• Updates for a year

License

MIT. Use it, change it, share it. Please keep the credit to Brew Day.